- BCl$_3$: Boron has 3 valence electrons, and each chlorine atom contributes 7 valence electrons. Therefore, the total valence electrons for BCl$_3$ is 3 (from Boron) + 3x7 (from 3 chlorine atoms) = 24.
- PCl$_3$: Phosphorus has 5 valence electrons, and each
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